Medium-spin states in Cs-135

Publication Type
Journal Article
Year of Publication
Fotiades, N.
Cizewski, J. A.
Higashiyama, K.
Yoshinaga, N.
Teruya, E.
Krucken, R.
Clark, R. M.
Fallon, P.
Lee, I. Y.
Macchiavelli, A. O.
Younes, W.
Name of Publication
Physical Review C
Date Published
Short Title
Medium-spin states in Cs-135
Accession Number
ISBN Number

Limited information is currently known on medium-and higher-spin states for Cs-135, a neutron-rich nucleus amenable to shell-model calculations due to its proximity to the shell closures in Sn-132. In order to extend the level structure of Cs-135 to higher excitations, this nucleus was studied via prompt gamma-ray spectroscopy of fragments following the fission of the compound nucleus Th-226 formed in the O-18 (91 MeV) + Pb-208 fusion-fission reaction. Medium-spin states up to spin (23/2) and similar to 3.3 MeV excitation energy have been established. The observed states were compared with those in the neighboring N = 82(137)Cs nucleus, as well as with states in the neighboring N = 80 isotones. The coupling of the odd proton occupying the g(7/2) orbital to the yrast states in the Xe-134 and Ba-136 cores could account for the lower excited states of Cs-135. The experimental results are compared with predictions from shell-model calculations.